the Carinthian Molybdate of Lead. 319 
principally consisted of azotic gas, together with some sul- 
phureous acid, and some alkaline gas, which had made their 
way out of the vessels during the operation. 
Continuation of the Experiments on the Molybdate of Lead. 
From the effects which I observed to be produced when 
sulphate of ammoniac was distilled with molybdic acid, I was 
induced to examine in a similar manner the blue solution B ; 
but first I collected, washed, and dried the pale yellow pre- 
cipitate which had been formed when the sulphuric solution 
of the molybdic acid was saturated with ammoniac.* 
This precipitate, when dry, appeared of a deeper yellow, 
and easily dissolved in muriatic acid. 
Prussiate of pot-ash was then added to the clear solution, 
and precipitated the whole of the dissolved matter in the state 
of Prussian blue. 
The filtrated solution B was now evaporated till it became 
a dry concrete salt, the colour of which was pale greyish 
blue. 
I collected this salt, and having reduced it to powder, put 
it into a small glass retort, and having fitted on a receiver, I 
distilled it in the same manner as was employed with the sul- 
phate of ammoniac. 
The products which came over were also the same, and 
when the bottom of the retort began to be softened by the 
* Whenever the solution was sufficiently diluted, I always found that ammoniac 
precipitated the iron free from any part of the molybdic acid ; but if either of the 
fixed alkalies were used, a portion of molybdic acid was precipitated with the iron 
in a state similar to the first portions of those white flocculent precipitates, which have 
been already mentioned in § IX. and § X. 
T t 
MDCCXCV I. 
